PlayStation 3 = TV services are BBC iPlayer, ITV Player, 4OD, Demand 5, BBC Sport.
It also has Netflix, Lovefilm, YouTube and Crackle.
You can get music videos from Vidzone, use Sony's Music Unlimited service, and pay Karaoke game Singstar.
Also plays Blu-ray, Blu-ray 3D, DVD & CD as well as numerous digital photo, video and music files. It as a baic internet browser and can also be used for streaming content from other devices, such as PCs, phones, tablets etc.
Overall, it's a good experience. ITV player and 4OD are a little clunky as they are links to optomised websites, rather than dedicated apps. Netflix is particularly good, as it supports their "Super HD 1080p" and 3D content. (3D currently from USA service only, using "unblock-us" etc)
Xbox 360 = BBC iPlayer, 4OD, Demand 5, Sky Go, Now TV in term of traditional TV.
It also has video apps for Netflix, Lovefilm, YouTube, Blinkbox, Crackle, MSN Video, Daily Motion, IGN, Screenrish, Last.fm, Sesame Street (req Kinect), Gamespot TV, Nat Geo (req Kinect), Blip, Game Trailers, NBA Game Time, MLB.TV, Machinima, Cruncyroll, Cnet, Sony Pictures, Sports Picks, NFL Gamecenter, Indieflix, Wall Street Journal.
Music fans are covered by Vevo, Last.fm, Muzu, Napster and Absolute Radio apps. There is also a Karaoke app.
It can play DVD & CD as well as numerous digital photo, video and music files. Can aso be used for streaming content from other devices, such as PCs, phones, tablets etc. It also has Internet Explorer.
It's a largely slick experience, but does require a £40 a year subscription to Xbox Live to access most of the features. (That's in addition to any individual service subscriptions that may be required). Being able to control many of the functions from your phone or tablet is a nice touch. Voice and motion controls are also available via a Kinect sensor.
Sky+HD = As far on "on demand" content goes, Sky have all the bases covered, with all major broadcasters offering a catch up service. It also has a substantial library offering, with it's selection of movies particularly strong. There are also additional film rentals available. It's progressive download system ensures that the picture quality is excellent, regardless of your broadband speed.
But, it's worth noting that to access the likes of ITV Player, 4OD, and Demand 5 you have to be a Sky subscriber, at a minimum of £21.50 a month. BBC iPlayer is available "subscription free", but only works on a non-subscription box if the recording functions are active, which is available at a cost of £10 a month for ex-customers only. All other content mirrors your Sky channel subscription.
In short, if you're already a Sky customer, then it's brilliant, and well worth setting up. (Although some content can be slow to appear, and some never appears at all). But it's an expensive proposition if you're just looking for the FTA catch-up services.